Abstract
Forced structural vibration and cutting tool inaccuracy have been identified to be the primary causes of surface defects in rotary wood planing. This paper presents the development of a control strategy used to compensate for the effects of both vibration and cutting tool inaccuracy on planed wood surface finish. The solution is based on active vibration control and real-time modification of the cutting tool trajectory using an optimal Linear Quadratic Gaussian tracking controller. A small-scale mechatronic wood planing machine, which has an actively controlled spindle unit, has been designed for practical investigation of the proposed technique. Experimental results show that the applied compensation increased the dynamic performance of the machine and the quality of the surface finish produced.
Highlights
Rotary planing is one of the most important machining processes in the value-added woodworking industry [1,2]
This paper presents an active method used to compensate for the effects of cutting tool inaccuracy and spindle vibration in rotary wood plaining
The technique is based on real-time periodic optimisation of the cutting tool trajectory coupled with the rejection of the vibration disturbance acting on the spindle
Summary
Rotary planing is one of the most important machining processes in the value-added woodworking industry [1,2]. It has been established that forced vibration and cutting tool inaccuracy are the primary causes of surface quality degradation in wood planing [3]. Some ideas on how to improve the quality of planed wood surfaces through real-time adjustments of the cutting tool trajectories have been reported in the literature. Results show that these methods produce cuttermark heights below what is obtained from the conventional machining These techniques still do not compensate for the effects of vibration and cutter inaccuracy. Cutting tool inaccuracy compensation and active vibration control in rotary wood planing have been studied independently [9,10,20] there is a greater challenge in solving the two problems concurrently. Experiments are performed on a small-scale mechatronic wood planing machine in order to investigate the effects of the compensation on the surface finish quality
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